Thomas recounts stories about two chemists, Fritz Haber and Carl Bosch, who together discovered a way to create synthetic fertilizer. He also expounds beyond the book to describe what was simultaneously happening in Norway at Norsk Hydro (later Yara).
This discovery is credited with providing sustainable food for over 1/2 of the world's population.
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Related episode:
The Alchemy of Air - Changing the World Through Mineral Fertilizer